INA2181A2IDGSR - Dual 26V 350kHz Current Sense Amp | TI
料号： INA2181A2IDGSR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.31 | $0.31 |
| 10 | $0.28 | $2.80 |
| 100 | $0.25 | $25.00 |
| 500 | $0.22 | $110.00 |
| 1,000 | $0.19 | $190.00 |
INA2181A2IDGSR 概述
A current sense amplifier is a specialized differential amplifier that measures the tiny voltage drop across a shunt resistor and converts it to a ground-referenced output voltage proportional to load current. Within the power management IC hierarchy, current-shunt monitors sit alongside battery fuel gauges and hot-swap controllers as current-monitoring building blocks. Unlike general-purpose op-amps, current sense amplifiers tolerate common-mode voltages far above their own supply, enabling high-side current sensing in 24V-class rails from a low-voltage logic supply.
Key features include true bidirectional sensing (current flow in both directions reported via the REF pin offset), common-mode operation independent of the supply voltage, cost-optimized INAx181 family design, and dual channels in one small 3x3 mm package. The rail-to-referenced output and low-side extension to -0.2 V support both high-side and low-side shunt placement. The 350 kHz bandwidth at the A2 gain captures fast load transients in power-supply supervision loops.
Technically, the INA2181 uses a precision unidirectional/bidirectional input stage with a fixed-gain internal resistive network; the A2 gain option (50 V/V) is one of four pin-compatible gain variants (A1 = 20 V/V, A3 = 100 V/V, A4 = 200 V/V) in the same footprint, letting designers trade bandwidth, shunt value, and resolution without PCB changes.
Typical applications include battery charging and discharging current monitoring, laptop and tablet power supervision, motor drive current feedback, telecom and server 12V/24V rail monitoring, and industrial current-loop diagnostics.
Design tip: keep the shunt value low to limit dissipation, but ensure the full-scale shunt drop stays within the linear input range for the chosen 50 V/V gain; Kelvin-connect the sense traces directly to the shunt pads.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： INA2181A2IDGSR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： INA2181A2IDGSR （相同外形与封装尺寸） ——差异在于 Output Type, Package, Common-Mode Voltage Range, Channels, Qualification.
快速对比工具——选择替代料号进行并排对比：
INA2181A2QDGSRQ1
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.52 / 个
查看数据手册 →INA2181A1QDGSRQ1
✅ 直接替换✓ 有现货
$0.35 / 个
查看数据手册 →INA2181A4QDGSRQ1
✅ 直接替换✓ 有现货
$0.72 / 个
查看数据手册 →INA2181A1IDGSR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.52 / 个
查看数据手册 →INA2181A3IDGSR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.29 / 个
查看数据手册 →INA2181A4IDGSR
✅ 直接替换📋 参考替代料（不在目录中）
INA2181A2IDGSR 规格参数
| 通道数 | 2 (dual channel) |
| Gain (fixed) | 50 V/V (A2 option) |
| Bandwidth | 350 kHz |
| Common-Mode Voltage Range | -0.2 V to +26 V |
| Sensing Direction | Bidirectional |
| Sensing Topology | Low-side and High-side |
| 输出类型 | Voltage output, rail-to-rail |
| 工作温度 | -40C to +125C |
| 封装 | VSSOP-10 (DGS), 3.00 mm width |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Reel Size | 3000 units per reel (R suffix) |
| Typical Applications | Battery current monitoring, power-supply supervision, load current feedback |
INA2181A2IDGSR vssop-10 (dgs), 3.00 mm width 引脚配置指南
INA2181A2IDGSR（vssop-10 (dgs), 3.00 mm width 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： INA2181A2IDGSR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA2181A2IDGSR 适用于 6 应用s: Battery Charge/Discharge Monitoring, Motor Drive Current Feedback, Notebook and Tablet Power Supervision, Telecom and Server Rail Monitoring, Industrial Current Loop Diagnostics, Automotive Body and Powertrain Current Sensing.
Battery Charge/Discharge Monitoring
The INA2181A2IDGSR is well suited to battery current monitoring because its bidirectional architecture reports both charge and discharge current through one shunt resistor, with the REF pin set to a mid-scale reference to center the output at zero current. Its -0.2 V to +26 V common-mode range covers single-cell and multi-cell stacks regardless of the 3-5 V amplifier supply. The dual channels let a single device monitor the charging path and the load path independently. With 50 V/V gain, a 20 mV shunt drop at full load maps to 1 V of output swing; place the device between the shunt and the MCU ADC, and rely on the 350 kHz bandwidth to capture inrush transients that average current telemetry would miss.
推荐
Motor Drive Current Feedback
In brushed and BLDC motor controllers, phase or bus current must be measured quickly to implement current-limiting and torque loops. The INA2181A2IDGSR provides two channels, allowing simultaneous monitoring of two shunts, with 350 kHz bandwidth that tracks PWM ripple and fast fault currents. High-side shunt placement is supported by the 26 V common-mode range, independent of the amplifier supply, which simplifies layout in 12 V and 24 V motor buses. With 50 V/V gain, a 30 mV full-scale shunt drop yields 1.5 V output, well within a 3.3 V ADC range. Place the amplifier close to the shunt with Kelvin connections, and filter the output with a simple RC matched to the control loop bandwidth to reject PWM noise.
推荐
Notebook and Tablet Power Supervision
Portable computer designs monitor battery, system rail, and charger currents simultaneously, and the INA2181A2IDGSR condenses two of these measurements into one 3x3 mm VSSOP-10 device. Its cost-optimized INAx181 family positioning targets exactly this high-volume, price-sensitive application. The -0.2 V to 26 V common-mode range handles battery stacks and adapter inputs, while the rail-to-referenced voltage output connects directly to a fuel gauge or PMIC ADC input without level shifting. The 350 kHz bandwidth captures load transients for platform power management. Choose the shunt so that light-load currents still generate measurable shunt drops, since the 50 V/V gain sets the resolution ceiling; heavier loads can use smaller shunts to limit dissipation.
推荐
Telecom and Server Rail Monitoring
Telecom -48 V-derived and server 12 V rails require continuous current supervision for load management and fault detection. The INA2181A2IDGSR monitors high-side shunts at up to 26 V common-mode from a low-voltage supply, and its dual channels can watch two rails with one device, cutting BOM cost. The 350 kHz bandwidth detects fast overcurrent events before protection circuitry trips, and the voltage output feeds comparators or supervisory MCUs directly. With 50 V/V gain, select shunt resistance so maximum load current produces roughly 1-2 V output within the ADC or comparator window. Maintain Kelvin sensing across the shunt and keep the input traces short and paired to limit noise pickup in the electrically noisy server environment.
推荐
Industrial Current Loop Diagnostics
Industrial control panels use current monitoring for predictive maintenance, actuator health, and overload detection on 24 V buses. The INA2181A2IDGSR's 26 V common-mode ceiling and -40C to +125C rating suit these environments, and dual channels let one device watch a motor branch and a heater branch simultaneously. The voltage output scales with 50 V/V gain, so a 40 mV full-scale shunt drop provides 2 V into a PLC analog input. Its 350 kHz bandwidth catches fast fault signatures such as locked-rotor inrush. Filter the output with an RC matched to the diagnostic sampling rate, and consider the Q1 automotive variant (INA2181A2QDGSRQ1) when the same board is reused in vehicle-mounted industrial equipment requiring AEC-Q100 qualification.
推荐
Automotive Body and Powertrain Current Sensing
For automotive 12 V loads such as lamps, pumps, and actuators, the AEC-Q100 qualified INA2181A2QDGSRQ1 drop-in variant of this device provides the same 50 V/V gain, 26 V common-mode range, and 350 kHz bandwidth with automotive qualification. The bidirectional sensing covers regenerative and load-dump current directions with a single shunt. Designers validate the footprint once and can then qualify either the standard INA2181A2IDGSR for industrial derivatives or the Q1 part for vehicle platforms. With 50 V/V gain, shunt values of a few milliohms produce usable full-scale outputs; ensure the shunt power rating accounts for peak fault currents, and use the amplifier output to trigger the body-controller ADC for threshold-based protection.
推荐
推荐产品汇总
工程参考数据： INA2181A2IDGSR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | INA2181A2QDGSRQ1 | INA2181A1QDGSRQ1 | INA2181A1IDGSR | INA2181A4IDGSR |
|---|---|---|---|---|---|
| Package | VSSOP-10 (DGS) | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Fixed Gain | 50 V/V (A2) | 50 V/V (A2) | 20 V/V (A1) | 20 V/V (A1) | 200 V/V (A4) |
| Channels | 2 | 2 | 2 | 2 | 2 |
| Common-Mode Range | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V |
| Bandwidth | 350 kHz | 350 kHz | 350 kHz family | 350 kHz family | 350 kHz family |
| AEC-Q100 Qualified | No (standard grade) | Yes | Yes | No | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
关键差异点
- Dual channels in a 3x3 mm footprint （对比 INA181A2IDCNR)
- Gain flexibility without PCB rework （对比 INA2181A4IDGSR)
- Cost-optimized family positioning （对比 INA2180A2IDGKR)
设计说明
Kelvin-connect the sense inputs: route the IN+ and IN- traces directly to the shunt resistor pads, not to shared current-carrying copper. Even 1 mohm of trace resistance with a 5 A load adds 5 mV of error, which the 50 V/V gain amplifies to 250 mV of output error - a large fraction of the usable output range. Keep the two sense traces as a short, closely spaced pair to reject noise, and place the INA2181 within a few millimeters of the shunt.
Do not leave the REF pin at a high-impedance source. The REF pin sets the zero-current output level and its input resistance participates in the gain network; driving it through a large resistor or unbuffered divider shifts gain accuracy. For bidirectional measurement, buffer a mid-scale reference into REF; for unidirectional use, tie REF directly to ground. Also confirm your shunt full-scale drop: with 50 V/V gain, the maximum linear shunt drop is limited by output swing headroom on a 3.3 V or 5 V supply.
In PWM-driven motor or switcher environments, add a first-order RC filter on each amplifier output (for example 100 ohm and 1 nF, giving roughly 1.6 MHz corner) before the ADC input to attenuate switching noise while preserving the 350 kHz signal bandwidth. Avoid filtering the IN+/IN- inputs asymmetrically, because input filter mismatch converts common-mode noise into differential error. Estimated filter values should be validated against your PWM frequency and ADC sampling scheme.
合规信息
Standard TI commercial grade; the INA2181A2QDGSRQ1 variant is the AEC-Q100 qualified option. REACH/halogen status per TI product page not captured in retrieved data.
